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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a08a2b5b83d38d88b98084fc2f7e1e44fd11abb803c8c6c26f0e2401198f859' 
  AND token = 'nT404H8nLaPoBaF3j3esHFQypocNkO3qlfYC6PtcpMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}